2012 Mazda 3 wont start unless jumped?

I own a 2012 Mazda 3. The vehicle has been amazing till just the other day.. I went to start the car and got a no crank. The headlights work, all dash are operating as usual. . . I uses cables to jump the battery and went to have the car tested right away. The auto center advised that the battery has about 485 cold cranks left out of 500 but was about a 4 year old battery and I should replace it. They also tested the altinater and said it gave a good reading....just for sanity I asked them to remove the negative line to the battery terminal to see if the car stayed running, and it did. I know it's not the starter either because a jump wouldn't fix that issue. My question is WHAT THE HECK IS WRONG THEN? I can't be the first person in history of Mazda to have this issue. It seems like something stupid, but what? Please help me figure out this issue. . . Someone had this problem before I know it's not just me.Thanks,Drew

Do you know anything about the fuse that is on the
battery terminal? It's yellow but looks burnt. . .it
looks like it goes to the positive side... what is this
and can it be the problem? The auto center
replaced the battery again tonight with a new one.
Checked the terminal and they are tight as well as
the belts ....all looks good... but out of nowhere the
car just no cranks... jump it.. all problems go away.
I don't know if this is just my imagination, but it all
began when my fiancé and I took a road trip to Lake
George, NY... see,...we're from Queens and it's
about a 270 mile trip one way ...540 rt.. I noticed
that too me the car didn't seem like it had the hp it
use too, but in thought it was just me.
I had a issue with a vehicle I uses at work that the
coil pack went bad... I know I sound ignorant but I
know very little about M3's hence why I'm here...
Can a spark plug issue cause this... someone had
this problem befor me I'm sure...

For the hell of it... I just went outside to try it...
Started right up...?
But do I drive to work and risk getting stuck there
with nobody to jump me...should I order a new
terminal fuse?
Everyone at tge dealer just says ,... oh just bring it in
..no one is honest there ... they won't tell.me it hey
ever heard of this issue. $60 just to have them
look..just bought a new battery and got an oil
change. ..
$260.00. WTH?...
The auto center said the car ONLY calls for
synthetic ...
PS first oil change. ...just bought the car in May/ 16

Sounds to me like there is a problem at that fuse you are talking about. I would address that. Without being there a intermittent problem like this is hard to put a finger on. So when it does not turn over, is it just dead? Dragging starter noise or click? Jumping the vehicle seems to give it the extra boost to get it going, which is telling me something is causing resistance, like possibly that fuse, I'm thinking you may have to have the starter checked also. But in actuality the starter should be fine, I'm leaning more toward the starter relay or a worn (chaffed) cable, or bad cable connection. One other thing to check when this happens is the ignition switch, by using a digital multi-meter to see if power is getting to the starter.

Here are the following diagnostic steps that were
taken so far:
* battery was checked comma it seemed to be ok...
but, I replaced it with a new one anyway.
* battery terminal wires are quite secure.
* the alternator was checked and seems to be fine.
* belts to alternator are tight.
* relay fuse for starter is good. "Square black fuse"
* the only thing I can see visually is there is a yellow
fuse on the actual positive terminal line going to the
battery that looks burnt. I don't know what it is
called or how to find a new one, but it's the
rectangle fuse that you see when you open the
hood and look at the battery.
I need to try and replace this and see if it's the
stupid easy simple little problem that was
overlooked.

I am having a similar experience as you had... I went
to start my car and it wouldn't turn over... all lights
turned on but wouldn't turn over... tried a hour later
started up with out having to boost it.. took it right
to the shop they tested the battery and said it's fine
a bit on the weak side as it a 2012 I could replace it
if i wanted to.. and i did as winter was about to start
didnt want to deal with this in snow... 4 months later
i went to start my car and it wouldn't turn over... I
boosted it the next morning and it was fine after
that... fast forward it 2 more months and I started
the car the other day and I could smell something
burning... opened the hood notice of the positive
post one of the connecting wires was smoking...
took it to the shop... they tested everything all
connections are on and everything tested perfect
how ever 5mins later they notice the smoke and
hand to find what the cause of it... looks like the
fuse on the battery needs to be replaced and the
wires had to be cut and reattached.. I have the
option to replaces the cable wires...

I'm having the same exact issue. I have a
2010 Mazda 3S grand touring. It has just
over 50,000 miles on it and has been a great
car so far. Went to start it the other day the
battery was dead. Took the battery to
AutoZone they tested it said the battery was
dead but no dead cells. They charged it I
brought it back home put it back in my car
car started up fine. Drove it around the
block to test it battery light came on after 5
to 10 minutes ABS light came on the Bose
sound system flashed on and off Power
steering light came on the car acted as if it
were going to stall. It did not stall I made it
back home turned it off tried to restart and it
would not start. I had it towed into the
Mazda dealership. After having it for eight
hours they called me and told me simple fix
it needs a new battery! I explain to them
what I had done they said nope it's a bad
battery we put a new one in. Please pay the
cashier $183… Three days later I went to
drive my car again same exact thing
happened… Called the dealership told them
it's obviously not the battery because now
they're $183 battery is dead in my vehicle
there is something draining the battery. They
told me on their last testing that the
alternator was good… So we'll see what
they say now

Has anyone found what was causing this issue with the car
not wanting to start just randomly? My girlfriends car has
been doing this for months and we just keep jump starting
it and every time we have it tested everything comes back
ok. Have not looked into all the wires but I do know that the
battery terminals are tight as well as on the starter..wasn’t
sure if anyone else has found what caused your vehicle to
not start anything will help out.

Well, after telling my car into the shop for
the second time… They told me it needed
and complete new wiring harness… I asked
them are you sure it's not just the
alternator? They said no, the alternator
tested great. They put a new wiring harness
in called me to pick up my car… Then they
called me right back and said sorry we are
still having the same problem even with the
new wiring harness. I was furious! I
escalated this to management and they
found that the alternator was the problem.
Even though it tested good on two other
occasions! They replaced the alternator and
my car has been working fine since.

Well thank you for the response I was thinking it had to be
in the wiring harness or alternator but since the battery
never died completely and would start up just fine even
after hooking a charger to it for just a couple seconds I was
confused thinking it couldn’t be the alternater but there is
so many electronics on vehicles now you never know
where to start

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